Matrix-pliers.



1,176,793. Patented Mar. 28,1916.

W. H. TUTTLE.

MATRIX PLIERS.

APPLICATION FILED AUG-30. 1915 Elma/Mom Ml/Mkiifi fume;

THE COLUMBIA PLANQGRAPH 60., WASHINGTON, n. C.

WILLIAM H. TUTTLE, OF KANSAS CIQIX, MISSOURI.

MATRIX-P13113135.

Specification of Lettrs latent.

.PatentedMar. 2.8, 1916.

Application filedfAng-ust330, "1 915. ISeIialNo. 47;:39-1.

To all an ham itamayaconcern :Be it known that .I, WILLIAM H. Turrm,

a citizen of the United States, residing at Kansas City, in :the county of Jackson and State #of Missouri, have invented certain new and :useful Improvements in Matrix- Pliers; and I do declareith'e following to he a ifull clear and exact description -01 time invention, such as will enable others skilled in the lart to which itzapp'ertains to make and use the same, reference being had to the accompanying drawings, and -to the "letters andfigures of reference marked thereon,

' which form a part of this specification.

My invention relates to a tool for forming dental matrices and has for its principal object to provide a device of this character whereby the overlapping ends of a matrix may be easily, quickly and accurately connected without the use of solder or the like.

In accomplishing this object I have provided improved details of structure the preferred form of which is illustrated in the accompanying drawing, wherein:

Figure I is a perspective view of a tool constructed according to my invention, particularly illustrating the punch member on one of the jaws and the countersunk aperture in the other jaw through which the punch is projected to form the connection between the ends of the matrix. Fig. II is a central longitudinal section of the punch jaws. Fig. III is a detail view of parts of the overlapping ends of the matrix, as the same appear after they have been punched as the initial step in their connection. Fig. IV is a similar view of the parts after the punched flanges of the matrix members have been flattened onto the body of one of the matrix members to form the connection.

Referring more in detail to the drawing: 12 designate the jaws of the tool which, except for my improvements, closely rcsemble the jaws of an ordinary pair of pliers, the principal difference being that the jaw 1 contains a round aperture 3 in its outer end, and countersunk at the inner surface of the jaw, and the jaw 2 has a'punch bar 4: on its inner face in such position that when the jaws are closed the punch bars will project into the aperture 3 .in the opposite jaw member. The punch bar l is of conical shape for the greater part of its length at its base and has an elongated, relatively thin pointed shank which will easily project through a piece of soft metal, of the kind used in making dental matrices, the SH/id bars adjacent the face of its Jcarrying jaw, being .concaved to increase the size -of the hole ipunehed Jill 1the matrixzovertli at formed by the pointed shankand form a foundation upon which the punched .out metal ima-y aloe turned ibackiupon :the .face. of the matrix and form the lock EbtW'GGIl the matrix :members, the aperture 3 in the :jil-W :1 sbeing ofrsuch diameter irelativeito the. difl'll'ltfil'iOfjthe base portion of the punch 4 that the inner face of the jaw 1 engages the concaved punch .fac-e loefore coming into contact with the inner face of the jaw 2, so that the jaws do not meet, but all of the closing pressure is exerted on the punched out metal to form the lock.

In using the device, presuming the tool to be constructed and assembled as described, when the matrix metal has been curved to the proper shape and the ends overlapped, the jaws of the tool are placed on opposite sides of the overlapping ends of the metal and the jaws closed toward each other, so that the point of the punch 4: is projected through both pieces of the metal and into the aperture 3 in the opposite jaw of the tool. The point of the punch, being sharp, penetrates through the overlapped ends of the metal and projects into the aperture 3 in the jaw 1, the smaller part of the punch being long enough to fully penetrate the metal before the enlargement of the punched out holes in the metal takes place. It is apparent that as the punching of the holes, in the overlapped portions of the metal is started by the relatively sharp point. the widening of the holes may be accomplished with comparatively light pressure, owing to the gradual increase in diameter of the punch bars 4, the countersunk recess about aperture 3 forming a seat for the larger conical portion of bar 4: in order to clasp the punched out parts of the metal closely together so that when they are turned over upon themselves by pressure from the punch, they will move in close relation and form a connection which is similar to an ordinary lap joint.

After the holes in the enlarged ends of the matrix have been'punched and widened as described, the punch is turned over so that the point of the bar 4 projects into the neck formed by the punched out metal, and when the jaws are moved together the concave surface of the punch member turns the punched out parts of the matrix metal over and presses the same tightly against the surface of the matrix, the punched out material' from the one lip lying within the 1na-,

terial of the other lip so that the two fold upon each other to form the joint; this action being somewhat similar to the set ting of an eyelet with an ordinary stationary V punch. With the matrix formed in this manner the ends of the same are, locked securely together so that the formation may be maintained, the sealing of the ends of the matrix being accomplished much more quickly and with greater accuracy than by the soldering or other methods.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters-Patent, is:

1, A tool of the character described comcopies of this patent may be obtained for five cents eaoh, by addressing prising a jaw having an aperture therein, and a mating jaw having a boss on 1ts face comprising a pointed end and an enlarged tapered base, the said aperture being coun-' tersunk on its inner face to seat the tapered base ofsaid boss. 7

2. A tool of the character described comprising a jaw having an aperture therein,

and a mating jaw having a boss on its inner jaws apart when In testimony whereof I afiix my'signature WILLIAM TUTTLE.

the Commissioner of Patents,

Washington, D. G. a 

